Message ID | 1392005051-54508-4-git-send-email-wangyijing@huawei.com (mailing list archive) |
---|---|
State | New, archived |
Delegated to: | Bjorn Helgaas |
Headers | show |
On Mon, 2014-02-10 at 12:04 +0800, Yijing Wang wrote: > +static u64 pci_device_serial_number(struct pci_bus *bus, int devfn) > +{ > + int pos; > + u32 lo, hi; > + > + if (!pci_bus_find_capability(bus, devfn, PCI_CAP_ID_EXP)) > + return 0; > + > + pos = pci_bus_find_ext_capability(bus, devfn, > PCI_EXT_CAP_ID_DSN); > + if (!pos) > + return 0; > + > + pci_bus_read_config_dword(bus, devfn, pos + 4, &lo); > + pci_bus_read_config_dword(bus, devfn, pos + 8, &hi); We have no macro for that? > + return ((u64)hi << 32) | lo; > +} Regards Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 2014/2/10 18:21, Oliver Neukum wrote: > > On Mon, 2014-02-10 at 12:04 +0800, Yijing Wang wrote: >> +static u64 pci_device_serial_number(struct pci_bus *bus, int devfn) >> +{ >> + int pos; >> + u32 lo, hi; >> + >> + if (!pci_bus_find_capability(bus, devfn, PCI_CAP_ID_EXP)) >> + return 0; >> + >> + pos = pci_bus_find_ext_capability(bus, devfn, >> PCI_EXT_CAP_ID_DSN); >> + if (!pos) >> + return 0; >> + >> + pci_bus_read_config_dword(bus, devfn, pos + 4, &lo); >> + pci_bus_read_config_dword(bus, devfn, pos + 8, &hi); > > We have no macro for that? Yes, I will try to define macros for them, thanks! > >> + return ((u64)hi << 32) | lo; >> +} > > Regards > Oliver > > > > > . >
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 432ac86..af06064 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -2168,6 +2168,36 @@ void pci_free_cap_save_buffers(struct pci_dev *dev) } /** + * pci_device_serial_number - get device serial number + * @bus: PCI bus the device on + * @devfn: the PCI device + * + * return the device serial number if device support, + * otherwise return 0. + */ +static u64 pci_device_serial_number(struct pci_bus *bus, int devfn) +{ + int pos; + u32 lo, hi; + + if (!pci_bus_find_capability(bus, devfn, PCI_CAP_ID_EXP)) + return 0; + + pos = pci_bus_find_ext_capability(bus, devfn, PCI_EXT_CAP_ID_DSN); + if (!pos) + return 0; + + pci_bus_read_config_dword(bus, devfn, pos + 4, &lo); + pci_bus_read_config_dword(bus, devfn, pos + 8, &hi); + return ((u64)hi << 32) | lo; +} + +void pci_dsn_init(struct pci_dev *dev) +{ + dev->sn = pci_device_serial_number(dev->bus, dev->devfn); +} + +/** * pci_configure_ari - enable or disable ARI forwarding * @dev: the PCI device * diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 4df38df..685301a 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -208,7 +208,7 @@ void __ref __pci_bus_size_bridges(struct pci_bus *bus, void __ref __pci_bus_assign_resources(const struct pci_bus *bus, struct list_head *realloc_head, struct list_head *fail_head); - +void pci_dsn_init(struct pci_dev *dev); /** * pci_ari_enabled - query ARI forwarding status * @bus: the PCI bus diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 6e34498..27d3e6f 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1324,6 +1324,8 @@ static void pci_init_capabilities(struct pci_dev *dev) /* Vital Product Data */ pci_vpd_pci22_init(dev); + pci_dsn_init(dev); + /* Alternative Routing-ID Forwarding */ pci_configure_ari(dev); diff --git a/include/linux/pci.h b/include/linux/pci.h index 470de02..3631859 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -354,6 +354,7 @@ struct pci_dev { struct list_head msi_list; const struct attribute_group **msi_irq_groups; #endif + u64 sn; /* device serial number, 0 if not support */ struct pci_vpd *vpd; #ifdef CONFIG_PCI_ATS union {